Gain and bandwidth enhancement of a singly-fed circularly polarised dielectric resonator antenna

Abstract

A technique is proposed for the enhancement of gain and circularly polarised (CP) bandwidth of a singly-fed CP dielectric resonator (DR) antenna. The specific geometry of DR is used to generate the orthogonal modes required for obtaining the CP response. The incremental harmonics of the fundamental and third-order modes, TE11δ+ 1 and TE31δ+ 1, are generated by stacking of the similar DR layer topped with metallic patch after an air gap. This enhances the gain and CP bandwidth of the antenna maintaining the generated orthogonal modes with the required phase difference. The antenna with single DR layer provides the CP bandwidth of 13.56% and gain 4.04 dBic. After stacking, the antenna provides the measured CP bandwidth of 24.75% and 7.32 dBic stable gain over the passband. In addition, the antenna provides 92.87% radiation efficiency in the passband.